Lambert j



L. I. BORDO.

BOILER PROTECTINGDEVICE. 1

APPLICATION FILED FEB. 6.1918.

% omrnn srarns earner oniucn.

LAMBERT J. BORDO, OF ROSLYN, PENNSYLVANIA.

BOILER-PROTECTING DEVICE.

To all whom it may concern Be it known that I, LAMBERT J. BoRDo, acitizen of the United States of America, and resident of Roslyn, gomeryand State of Pennsylvania, have 1nvented a certain new and usefulImprovement in Boiler-Protecting Devices, of which the following is atrue and exact description, reference being had to the accompanyindrawings, which form a part thereof.

y present invention has for its object to provide simple and eflectivemeans for automatically indicating a dangerous low water condition inboilers. In carrying out my invention I employ a fusible plug whichforms a part of the wall of a chamber communicating with theinterior ofthe boiler, but which is normally insulated against the internaltemperature of the boiler, but is subjected to steam temperature of theboiler immediately on a depression of the water level in the boiler to apredetermined minimum. The melting of the fusible plug, which occurswhen the latter is eXpoSed to the steam temperature of the boiler,permits the escape of steam from the boiler and thereby indicates thedangerous low water condition of the boiler.

The various features of novelty which characterize my invention arepointed out with particularity in the claims annexed to and forming apart of this specification. For a better understanding of the invention,however, and the advantages possessed by it reference should be had tothe accompanying drawings and descriptive matter in which I haveillustrated and described a preferred embodiment of my invention.

Of the drawings:

Figure 1 is an elevation of a portion of a boiler equipped with myinvention.

Fig. 2 is an elevation at right angles to Fig. 1, with parts shown insection, and

Fig. 3 is a sectional elevation of the fuse plug. J

In the drawings, A represents a boiler to which my improvement isapplied. My improved safety device E comprises a chambered casing, theinterior of which is connected at its lower end to the interior of theboiler below the normal water level therein. Advantageously, as shown,this casing is associated with a water level indicating gage B connectedto the boiler at top and bottom by valved connections C and C. In thismode of utilizing my invention I connect the Specification of LettersPatent.

in the county of Mont- Patented June 10, 1919.

Application filed February 6, 1918. Serial No. 215,594.

chambered casing E to the valve connection C by which the lower end ofthe gage B is connected to the boiler. In the particular constructionillustrated this is accomplished by forming the casing of the valvedconnect on C with a threaded lateral aperture G into which I screw oneend of a pipe elbow D, whlch may be regarded as forming the lowerportion of the chambered casing E. Into the other end of the elbow D,which is turned upward, I screw the lowerend of a pipe section which atits upper end is connected to a casing part F threaded on the upper endof the pipe section. Threaded to the upper end of the casing part F isthe casing part G which is formed at its upper end with a threadedaperture receiving a hollow externally threaded plug H, in the bore ofwhich is cast, or otherwise secured, a core or plug I of some suitablealloy fusing at a temperature less than the steam temperature normallyprevailing in the boiler vent connection J is threaded into the casingmember G and is normally closed by the cock K. "Axially disposed in butnot filling the outer pipe section is a pipe L, secured at its upper endin a spiderlike portion R of the casing member F.- The lower end of thepipe L projects down into the elbow D. As shown, the casing element E issecured in its upright position by being passed through apertured ears Bformed on the body of the gage B.

With the normal range of boiler water level in which the water level isvisible through the gage window B, the casing element E, which is incommunication with the interior of the boiler through the elbow D andthe valve casing C, is filled with water. The water then filling theinterior ofthe tubular element E will be at a temperature substantiallylower than the steam temperature of the boiler and but little aboveatmospheric temperature on account of the poor heat conductivity of thewater o ulisotby. lo n he val ed jected to the steam temperature in theboiler almost instantly after the fall in the boiler water level permitssteam to enterthe elbow D. When exposed to the steam temperature thefusible plug I meltsythus permat ting steam to blow out through theaxial" passage in the hollow plug H. This dis charging jet of steamgives a very efiective and readily discernible indication of the e. asng ement, E.,. o in n h t ular nstruction lu mto y P lgthopjpe in,but/not; filling the outer PlPQ QQUQhI por ion member E inure .a peedyopo uro of hoi us bl p g,

to the steam temperature when, steamlis ad mitted to hotlower end. he.shorter, leg,

oi h siioho t, l j h phm onne i n werenot providedtherewould be atendency, ot he as ng. element E o remain ll d v with" water after. thewater level has fallen.

o nough r o permit. he steam totp'assi t ep 'p elb w;

My uoprovem n in the, form; sclosed sptoi irdev sed for! e.v 1 3 11 897tion, with" locomotive andmarine boilers, where it i,s ofi specia l futility. Its useisnot; strict d, how-Wet, o uoh o r 'Eher n sp oial, adntage. in mp oying my improved safety devioe ln conjunction with a waterevel gage. n: leagenorali mamie i l se as this faoili a es fio r ady ppi-- cation of the device to .a boiler,andanakesum. c ss ry any. spetalip p connection; to he boiler, properioriany. spetjiitl, va-lvejorrvalves.

for; li oonuo ti g the vio a rom he boilen 7 when, it, is, necessary to.renew, the; fusible, P g. l asso at on. f h dew-ice ith; a gage themanner; disclosed alsogmakles a ly pos i laf est he dev e. ar:-

flopjes of thisgpattll lmaztbe obtained'for flve; cents each, 'byaddressing the Commissioner of Patent? a the locomotive cab or engineroom which would be required ifthe gage and device wereseparately-attached to the'boiler.

While in accordance with thegfprovisions of thestatutes I haveillustrated and described thebest form of my invention now known to me;it will be apparent to those skilled in the art; that changes. maybetmade in, the form: of my invention without; :de: parting firom. itsspirit, and; thatiso mehfem tures. of, my inventlon-may jsometlmes beused to, advantage: WitllQllt' alfcorresponding use ofother features ofthe invention;

' Having now described.myinvention whatl I claim. as,newandideslre; tosecure. byv Let;

ters Patent, is;

per end, with a; wall; portion, formed otma terial' meltingata,temperature lower than, a th normal steam temperature of t11ebo1 'er,.

saidf casing being formed. withftwo passages leading from p the top. ofsaid casing; to different; levels adjacent the bottomutliereot and uiiting to ,form. asiphon disch arge from, said, chamber; for, the water,contalnediinithe upper portion thereof, when, 3. 15511; in; boiler waterlevel. permits steam to enter. the lowerv end of saidchamber i 7 ,1 A.low. vwater-ind "eating deyicellior 'boil s; c mprising: a chaunloereclv oas na adagtod' to be connected at-its lower endto the water;

space of the boiler, and provided at its uppen end zwith a wall;portion; formedoft, a rlal. m lt ng; at. a temperiatule lowen; 1 1

n t ey no mal f st am temperature of;- the b ilert, said casing belngfbrliie'gh ithflti '7 1 7 P a ea ing ito the" tOpofiSaid casing jto,diflerentlevels,adjacenttheQbotton thQr Y f andg u iting to; formasiphon discharge from, said chamberfon the, water contained.

in the upper portion thereof;whenta fallin" a o; enterl boiler waterlevel per1n'-its stea 1 p the lower end; of sald chamberancha -,valve dair vent conneotodtothe uppert end of saidfl f hambered easingWashington, D.- G3;

tamgrauaqrgiiijgeo aho;*f f r

